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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A062231 Numbers k such that the smoothly undulating palindromic number (97*10^k - 79)/99 is a prime.

Table of values

n	a(n)
1	9
2	27
3	45
4	237

List of values

[9, 27, 45, 237]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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